/**
 * Copyright (c) 2013-2020 Contributors to the Eclipse Foundation
 *
 * <p> See the NOTICE file distributed with this work for additional information regarding copyright
 * ownership. All rights reserved. This program and the accompanying materials are made available
 * under the terms of the Apache License, Version 2.0 which accompanies this distribution and is
 * available at http://www.apache.org/licenses/LICENSE-2.0.txt
 */
package org.locationtech.geowave.core.store.data;

import java.util.ArrayList;
import java.util.List;
import org.locationtech.geowave.core.store.flatten.FlattenedFieldInfo;
import org.locationtech.geowave.core.store.flatten.FlattenedUnreadData;

public class UnreadFieldDataList implements FlattenedUnreadData {
  private final List<FlattenedUnreadData> unreadData;
  private List<FlattenedFieldInfo> cachedRead;

  public UnreadFieldDataList(final List<FlattenedUnreadData> unreadData) {
    this.unreadData = unreadData;
  }

  @Override
  public List<FlattenedFieldInfo> finishRead() {
    if (cachedRead == null) {
      cachedRead = new ArrayList<>();
      for (final FlattenedUnreadData d : unreadData) {
        cachedRead.addAll(d.finishRead());
      }
    }
    return cachedRead;
  }
}
